摘要
合成出一系列La_(1-s)A′_sFeO_3(A′=Ca、Sr、Ba;0≤2≤1)复合氧化物催化剂,并研究了Ca、Sr、Ba部分取代La后催化剂对CO氧化活性的影响。以XRD测定其晶体结构。结果表明,除含Ca>0.5和Ba=1.0外均生成钙钛矿型结构。用XPS和TPD法研究了吸附性能。指认吸附氧是CO氧化的活性物种,并初步解释了活性规律的成因。
A scries of La1-zA' xFeO3(A' =Ca, Sr, Ba; 0≤x≤1) was prepared. CO oxidation activity was studied when La was substituted partly by Ca, Sr, Ba and the crystal structure was measured by XRD. The adsorption properties were studied by XPS and TPD. It was found that the alkaline earth element substituted complex oxides (except that containing>0. 5 Ca and 1. 0 Ba) are of the perovskite type. Based on the obtained results it can be concluded that the adsorbed oxygen ions are responsible for the oxidation of CO. In addition, we tried to do some explanation for the activity of the mentioned reaction.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第5期491-495,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
